Mazda RX-8. Manual - part 15

AUTOMATIC TRANSMISSION [SJ6A-EL]

05–13–19

05–13

CONTROL VALVE BODY COMPONENT OUTLINE [SJ6A-EL]

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•

The control valve body supplys oil by switching the oil circuit for the hydraulic pressure generated by the oil 
pump. Based on the control signal from the TCM, the solenoid valves are activated to control the hydraulic 
pressure to the clutch and brakes, performing gear shift and TCC. In addition, an appropriate amount of oil is 
supplied to the torque converter, planetary gears and lubricating parts.

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TCM

CONTROL VALVE BODY COMPONENT

OIL PAN

SIGNAL

OIL PUMP

RETURN

SEND 
ATF

GENERATES HYDRAULIC PRESSURE

OIL PUMP 
PRESSURE

SHIFT SOLENOID A, B, C, D, 
E, F, G

CLUTCHES, 
BRAKES

OPERATE 
PRESSURE

TORQUE 
CONVERTER

SEND ATF

OIL COOLER

RETURN

LUBRICATION

RETURN

PLANETARY 
GEAR

LINE PRESSURE 
CONTROL SOLENOID

TCC CONTROL SOLENOID

REGULATOR VALVE

MODULATOR VALVE

SHIFT VALVES, 
CONTROL 
VALVES

ASSURES OPERATION 
HYDRAULIC PRESSURE 

E5U513ZS5013

AUTOMATIC TRANSMISSION [SJ6A-EL]

05–13–20

ELECTRONIC CONTROL SYSTEM CONSTRUCTION [SJ6A-EL]

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ECCENTRIC SHAFT 
POSITION SENSOR

MAF SENSOR

ECT SENSOR

PCM

TCM

BRAKE SWITCH

APP SENSOR

TURBINE SENSOR

VSS

TR SWITCH

TFT SENSOR

SHIFT 
SOLENOID C

SHIFT 
SOLENOID B

SHIFT 
SOLENOID D

SHIFT 
SOLENOID A

SHIFT 
SOLENOID E

LINE PRESSURE 
CONTROL SOLENOID

SHIFT 
SOLENOID F

SHIFT 
SOLENOID G

TCC CONTROL 
SOLENOID

SELECTOR INDICATOR LIGHT

AT WARNING 
LIGHT

GEAR POSITION 
INDICATOR LIGHT

SELECTOR LEVER COMPONENT

 · 

M RANGE SWITCH

 · 

UP SWITCH

 · 

DOWN SWITCH

STEERING SHIFT SWITCH 
(DOWN SWITCH)

STEERING SHIFT SWITCH 
(UP SWITCH)

EHU513BS8002

AUTOMATIC TRANSMISSION [SJ6A-EL]

05–13–21

05–13

ELECTRONIC CONTROL SYSTEM BLOCK DIAGRAM [SJ6A-EL]

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ELECTRONIC CONTROL ITEMS AND CONTENTS [SJ6A-EL]

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TCM

PCM

CAN

CAN

TRANSMISSION 
CONTROL 
SYSTEM

TURBINE 
SENSOR

TR SWITCH

TFT SENSOR

VSS

INPUT SIGNALS

CONTROL VALVE 
BODY COMPONENT

OUTPUT SIGNALS

GEAR POSITION 
INDICATOR LIGHT

AT WARNING LIGHT

SELECTOR 
INDICATOR LIGHT

SHIFT SOLENOID 
A, B, C, D, E, F, G

LINE PRESSURE 
CONTROL SOLENOID

TCC CONTROL 
SOLENOID

INSTRUMENT CLUSTER

BRAKE SWITCH

MAF SENSOR

APP SENSOR

OTHER MODULE

UP SWITCH

DOWN SWITCH

M RANGE 
SWITCH

ON-BOARD 
DIAGNOSTIC 
SYSTEM

INPUT SIGNALS

DLC-2

OUTPUT SIGNALS

CAN

INPUT SIGNALS

ECCENTRIC SHAFT 
POSITION SENSOR

ECT SENSOR

ENGINE TORQUE 
SIGNAL

ENGINE TORQUE 
CONTROL SIGNAL

OUTPUT SIGNALS

INPUT SIGNALS

TFT CHECK CONNECTOR

EHU513BS8003

Item

Content

Shift control

•

Detects engine load and vehicle speed, and switches to optimum gear in accordance 
with preset shift program.

•

In D range, automatically switches between NORMAL, AAS, DOWN-SLOPE, UP-
SLOPE modes according to specific conditions.

Manual mode shift control

•

Shifts to selected gear position by manual shifting of the selector lever forward and 
back.

•

The up/down operation of the steering shift switch is the same as the manual operation 
of the selector lever.

TCC control

•

According to preset TCC point, performs TCC operation.

Torque reduction control

•

Optimally controls engine output torque when shifting.

Shift learning control

•

Performs optimal correction for clutch engagement pressure to reduce changes in 
engine performance and/or elapsed transmission.

On-board diagnostic system

•

Detects and/or memorizes failure of input/output part and transmission condition.

AUTOMATIC TRANSMISSION [SJ6A-EL]

05–13–22

COMPONENT DESCRIPTIONS (ELECTRONIC CONTROL) [SJ6A-EL]

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Part name

Function

Input system

VSS

•

Detects parking gear (output) revolution speed.

Turbine sensor

•

Detects direct and reverse disc clutch case (input) revolution 
speed.

TR switch

•

Detects selector lever ranges/positions.

M range switch

•

Selects driving modes (M range) and changes driving 
patterns.

Up switch

•

Detects shift up request.

Down switch

•

Detects shift down request.

TFT sensor

•

Detects ATF temperature.

CAN 
communication

Brake switch

•

Detects the brake pedal depressed.

Throttle opening signal 
(APP sensor)

•

Input throttle opening angle from PCM.

Engine speed signal 
(Eccentric shaft position 
sensor)

•

Input engine speed signal from PCM.

Engine torque signal
(MAF sensor)

•

Input engine torque signal from PCM.

Cruise control signal

•

Detects cruise control is in use.

Engine coolant 
temperature signal
(ECT sensor)

•

Input engine coolant temperature signal from PCM.

Output system

ON/OFF type

Shift solenoid A

•

Controls the clutch engagement pressure.

Shift solenoid B

•

Controls the clutch engagement pressure.

Shift solenoid C

•

Controls the clutch engagement pressure.

Shift solenoid D

•

Controls the clutch engagement pressure.

Shift solenoid E

•

Controls the clutch engagement pressure.

Linear type

Line pressure control 
solenoid

•

Adjusts the line pressure.

TCC control solenoid

•

Controls the TCC hydraulic pressure.

Shift solenoid F

•

Controls the clutch engagement pressure.

Shift solenoid G

•

Controls the clutch engagement pressure.

CAN 
communication

AT warning light

•

Illuminates when failure is detected by diagnosis function.

Speedometer signal

•

Outputs the vehicle speed signal to speedometer.

Reduce torque signal

•

Sends signals to the PCM during shifting.